I recently had a very wild game in the French Winawer (I was White).
I reached this position as shown (see picture on left).
White is clearly winning.
Black's Rook is there for the taking and taking the Rook with check is always a plus.
The idea behind this small exercise is to be able to see moves whilst moving the pieces in your head.
Now calculate the lines after 1. Bxf8+
Question 1: Can you see the mating position after 1.... Kxf8?
Answer can be found by highlighting between the brackets.
[ 1.... Kxf8 2. Qe7+ Kg8 3. Rd8 and mate follows]
We now know that Black should take back with the Queen.
So 1. Bxf8+ Qxf8 is pretty much forced.
For your convenience, I've attached the 2nd picture for this line. But you can still work it out in your head should you choose not to use the 2nd picture.
Question 2: Find a way to win/finish off Black.
If 2... bxc6 3. Rd7+ Kg8 4. Rd8 wins the Black Queen. Note that 3... Kh6 is not possible because of Qg5#
3. Rxf6! Qxf6
4. Rd7+ nabs the Black Queen
If Black makes any other move,
3. Rcd6 and Black is still going to lose the Black Queen because Rd7+ is coming]